Hitachi RAS-E10H2 - FAILURE DIAGNOSIS SUPPORT FUNCTIONS

No
.
1
Function Name
Self-diagnosis indication function
<Indicating
a
f
ailure
on
the
indoor
unit side
>
<Indicating
a
f
ailure
on
the
outdoor
unit side
>
Descr
iption
• T
he
“timer
lamp”
indicates
a
mode
of
f
ailure
detecte
d
on
the
indoor
or
outdoor
unit
side
by
b
linking
frequency
.
frequency.frequency
• A
f
ailure
detected
on
the
outdoor
unit
side
will
be
indicated
by
the
“timer lamp”
b
“timer lamp” b“timer lamp”
linking 4 times after
a
retr
y
oper
ation
has
been
perf
or
med
se
ve
ral
times
.
Note:
In
some
f
ailure
modes
,
only
the
retr
y
operation
is
repeated without lamp indication.
<F
ailure
modes
that
will
repeat
a
retr
y
operation
withou
t
the indoor unit lamp indication are as f
ollo
ws:>
OH ther
mistor temperature r
ise
Outdoor unit communication error
Po
wer v
oltage abno
wer voltage abnower v
rm
al
Less frequent def
ects
• T
he
“LD301”
indicates
a
mode
of
f
ailure
detected
on
the outdoor unit side
by
b
linking frequency
.
linking frequency.linking frequency
Upon
f
ailure
detection,
the
outdoor
unit
will
shut
do
wn
and
the
LD301
continues
to
b
link
until
the
unit
is
reset.
(In
the
ev
ent
of
comm
unication
errors
,
the
LD301
continues to b
link until communication is restored.)
THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS
No. Blinking of Timer lamp Reason for indication Possible cause
Reversing valve defective
When the indoor heat exchanger
temperature is too low in th
e
heating mode or it is too high in th
e
cooling mode.
Outdoor unit is under forced
operatio
n
Outdoor unit electrical components
defetive
When the outdoor unit is in forced
operation or balancing operatio
n
after forced operation
Indoor/outdoor interface defectiv
e
When the interface signal from th
e
outdoor
When the same error mode is detected
8 times within 30 minutes from outdoor
unit electrical components.
(However, when error is detected 8
times within two hours only for outdoor
thermistor.)
unit is interrupted.
Room thermistor or heat exchanger
thermistor is faulty
When room thermistor or heat
exchanger thermistor is opened
circuit or short circuit.
Over-current detection at the DC fan
motor
when over-current is detected at th
e
DC fan motor of the indoor unit.
IC401 or IC402 data reading erro
r
When data read from IC401 or
IC402 is incorrect
.
(1) Reversing valve defectiv
e
(2) Heat exchanger thermistor
disconnected
(only in the heating mode)
(Note)
The malfunction mode is entered th
e
3rd time this abnormal indication
appears (read every 3 minutes)
.
Electrical parts in the outdoor uni
t
(1) Indoor interface circui
t
(2) Outdoor
Outdoor unit electrical components
(For details, operate again using
remote comtroller and check from
self-diagnosis display of outdoor
unit.)
interface circuit
(1) Room thermistor
(2) Heat exchanger thermistor
(1) Indoor fan locked
(2) Indoor fan motor
IC401 or IC402 abnormal
<Cautions>
(1) If the interface circuit is faulty when power is supplied, the self-diagnosis display will not be displayed.
(2)
If the indoor unit does not operate at all, check if the connecting cable is connected to the outdoor unit.
(3) To
check operation again when the timer lamp is blinking, you can use the remote control for operation
(except for mode mark
1).
1
2
3
4
5
6
7
( Lights for 0.35 sec. at interval of 0.35 sec.)
10 times
3
times
1
time
2 times
13 times
2 sec.
2 sec.
2 sec.
2 sec.
2 sec.
1
9
times
2 sec.
(3) Indoor control P.W.B.
4 times
2 sec.
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